fix(v-alert): close icon now inherits color
fix(v-alert): close icon now inherits color

when using the **outline** prop, the dismiss icon was not being properly styled

fixes #2762

Phlow2001/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,vuetifyjs/vuetify,Webifi/vuetify,Phlow2001/vuetify,Webifi/vuetify,vuetifyjs/vuetify,Webifi/vuetify,Phlow2001/vuetify